Feature request: "Ruler" style croshair

[notevenaperson]

Aligning screen elements is easier with a crosshair that looks like this:

[allmeta]

Maybe it's possible to create a shader that does it?

[meganukebmp]

Maybe it's possible to create a shader that does it?

This will work

#version 120
uniform sampler2D texture;
uniform sampler2D desktop;
uniform vec2 screenSize;
uniform vec2 mouse;

varying vec2 uvCoord;

void main() {

    vec2 pixel = vec2(1,1)/screenSize;

    vec2 mpos = vec2(mouse.x, -mouse.y)/screenSize + vec2(0,1);
    
    vec4 color = vec4(0,0,0,0);
    if (distance(mpos.x, uvCoord.x) < pixel.x || distance(mpos.y, uvCoord.y) < pixel.y) {
        color = vec4(1,1,1,1);
    }

    gl_FragColor = color;
}

[notevenaperson]

$ slop
Failed to detect a compositor, OpenGL hardware-acceleration disabled...

I don't use a compositor so a shader isn't the solution for me

This will work

#version 120
uniform sampler2D texture;
uniform sampler2D desktop;
uniform vec2 screenSize;
uniform vec2 mouse;

varying vec2 uvCoord;

void main() {

    vec2 pixel = vec2(1,1)/screenSize;

    vec2 mpos = vec2(mouse.x, -mouse.y)/screenSize + vec2(0,1);
    
    vec4 color = vec4(0,0,0,0);
    if (distance(mpos.x, uvCoord.x) < pixel.x || distance(mpos.y, uvCoord.y) < pixel.y) {
        color = vec4(1,1,1,1);
    }

    gl_FragColor = color;
}

Nice. You could add your shader to https://github.com/naelstrof/slop/tree/master/shaderexamples in a pull request.

[meganukebmp]

I don't use a compositor so a shader isn't the solution for me

Do you even see the generic outline when making a selection? If so, you might be able to just use that drawing code to also add your crosshair https://github.com/naelstrof/slop/blob/master/src/xshaperectangle.cpp

[notevenaperson]

Do you even see the generic outline when making a selection?

I do.

If so, you might be able to just use that drawing code to also add your crosshair https://github.com/naelstrof/slop/blob/master/src/xshaperectangle.cpp

Thanks for the pointer, I could do it someday.